Time reversal and spin-adapted wave-functions
✍ Scribed by J. Vojtík; J. Fišer
- Publisher
- John Wiley and Sons
- Year
- 1976
- Tongue
- English
- Weight
- 186 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0020-7608
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
The symmetric group approach SGA is used to derive formulas for the Hamiltonian matrix elements between perturbatively generated, highly contracted Ž . configuration state functions CSF . The first-order Møller᎐Plesset, Epstein᎐Nesbet, and Krylov corrections are examples of such CSFs. They have been
## Abstract Wave‐functions of various spin‐dependent and spin‐free methods are examined from the point of view of the requirements of the exclusion principle and the spin projection. It is shown that the “two‐rowed” or “two‐columned” requirements of the standard Young tableaux are necessary but not
## Abstract Addition and subtraction operators defined on some subspaces of the full CI space are introduced. It is shown that the effect of these operators on Löwdin many‐electron wave functions consists in adding or removing an electron without destroying spin symmetry. Upward and downward recurr